Page 29 - TBIS_15194-2019_(EN)_3nd

TBIS 15194:2019

4.3 Mechanical requirements

4.3.1 General

4.3.1.1 Definition of brake tests

Brake tests to which accuracy requirements apply, as in 4.3.1.4, are those specified
in 4.3.5.3 to 4.3.5.6 inclusive.

4.3.1.2 Definition of strength tests

Strength tests to which accuracy requirements apply, as in 4.3.1.4, are those
involving static, impact or fatigue loading as specified in 4.3.5.6 to 4.3.12, 4.3.13

inclusive and 4.3.19.2.
4.3.1.3 Numbers and condition of specimens for the strength tests

n general, for static, impact and fatigue tests, each test shall be conducted on a new
test sample, but if only one sample is available, it is permissible to conduct all of
these tests on the same sample with the sequence of testing being fatigue, static and
impact.

When more than one test is conducted on the same sample, the test sequence shall

be clearly recorded in the test report or record of testing.
NOTE It ought to be noted that if more than one test is conducted on the same sample,

earlier tests can influence the results of subsequent tests. Also, if a sample fails when it has
been subjected to more than one test, a direct comparison with single testing is not
possible.

In all strength tests, specimens shall be in the fully-finished condition.

4.3.1.4 Accuracy tolerances of test conditions for brake tests and strength tests

Unless stated otherwise, accuracy tolerances based on the nominal values shall be
as follows:

Forces and torques 0/+5 %
Masses and weights ±1 %
Dimensions ±1 mm

Angles ±1°
Time duration ±5 s
Temperatures ±2 °C

Pressures ±5 %

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